US9019805B2 - Multilayer optical recording medium, drive device, reproducing and recording apparatus, and inspection method for multilayer optical recording medium - Google Patents
Multilayer optical recording medium, drive device, reproducing and recording apparatus, and inspection method for multilayer optical recording medium Download PDFInfo
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- US9019805B2 US9019805B2 US13/798,747 US201313798747A US9019805B2 US 9019805 B2 US9019805 B2 US 9019805B2 US 201313798747 A US201313798747 A US 201313798747A US 9019805 B2 US9019805 B2 US 9019805B2
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- recording medium
- multilayer optical
- warpage
- degree
- layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
Definitions
- Embodiments described herein relate generally to a multilayer optical recording medium, a drive device, and an inspection method for an optical recording medium.
- optical recording media As optical recording media, optical disks such as a Digital Versatile Discs (DVDs) and Blu-ray Discs (BDs) are conventionally known. Such optical recording media are formed to enable reproduction of information or both reproduction and recording of information.
- DVDs Digital Versatile Discs
- BDs Blu-ray Discs
- Such optical recording media are formed to enable reproduction of information or both reproduction and recording of information.
- the optical recording media there is known a technology that enhances recording density in a recording layer through realization of short laser wavelength, high objective lens numerical aperture, use of a recording medium material suitable for high-density recording, countermeasures against noise in reproduction signal processing, and other features.
- multilayer optical recording medium in which multiple guide layers and multiple recording layers are provided or a drive device that performs, for example, recording or reproduction using this multilayer optical recording medium.
- the multilayer optical recording medium may be warped by internal stress due to an environmental change such as a temperature and humidity or age deterioration in some cases.
- an environmental change such as a temperature and humidity or age deterioration in some cases.
- functions of the multilayer optical recording medium may possibly be lost and, for example, a non-recorded region may be generated or a recorded region may be overwritten.
- FIG. 1 is a plan view showing a configuration of a multilayer optical recording medium according to an embodiment
- FIG. 2 is a cross-sectional view showing a primary configuration of the multilayer optical recording medium
- FIG. 3 is a cross-sectional view schematically showing an example of the primary configuration of the multilayer optical recording medium
- FIG. 4 is an explanatory view showing a configuration of a drive device used for the multilayer optical recording medium
- FIG. 5 is a flowchart showing an example of a recording method with respect to the multilayer optical recording medium using the drive device.
- FIG. 6 is a flowchart showing an example of a detection method for a degree of warpage of the multilayer optical recording medium using the drive device.
- a multilayer optical recording medium comprises: a substrate; a guide layer group that is provided on the substrate and has one or more guide layers in which positional information in a radial direction is recorded and which reflect a laser beam emitted from an optical device; and a recording layer group that is provided on the substrate and has recording layers in which information can be recorded and which reflect a laser beam emitted from the optical device.
- the recording layer group positional information of the recording layers associated with the positional information recorded in the guide layers and control information of the optical device where reflected light volumes of the laser beams on the guide layers and the recording layers become maximum at the positions in the radial direction are recorded at the positions in the radial direction of the recording layers.
- a multilayer optical recording medium 100 , a drive device 1 , and an inspection method of the multilayer optical recording medium 100 according to this embodiment will now be described with reference to FIG. 1 to FIG. 6 .
- FIG. 1 is a plan view showing a configuration of the multilayer optical recording medium 100 according to an embodiment
- FIG. 2 is a cross-sectional view showing a primary configuration of the multilayer optical recording medium 100 which is specifically a cross section taken along line II-II in FIG. 1 showing configurations of a guide layer group 111 and a recording layer group 112
- FIG. 3 is a cross-sectional view schematically showing a primary configuration of the multilayer optical recording medium 100 which is specifically an example of a sign Cg 1 and a sign Cr 1 of a second guide layer 122 and a tenth recording layer 140 at a position P 1 of the multilayer optical recording medium 100
- FIG. 1 is a plan view showing a configuration of the multilayer optical recording medium 100 according to an embodiment
- FIG. 2 is a cross-sectional view showing a primary configuration of the multilayer optical recording medium 100 which is specifically a cross section taken along line II-II in FIG. 1 showing configurations of a guide layer group 111 and a recording layer group 112
- FIG. 4 is an explanatory view showing a configuration of the drive device 1 used for the multilayer optical recording medium 100
- FIG. 5 is a flowchart showing an example of a recording method for the multilayer optical recording medium 100 using the drive device 1
- FIG. 6 is a flowchart showing an example of a detection method for a degree of warpage of the multilayer optical recording medium using the drive device 1 .
- the multilayer optical recording medium 100 is formed to enable recording and reproduction of information by using the drive device 1 or the like. As shown in FIG. 1 , the multilayer optical recording medium 100 is formed into a discoid shape.
- the multilayer optical recording medium 100 has a clamp portion 101 which is a support region fixed to the drive device 1 or the like at the center thereof and a recording region 102 in which information is recorded.
- the clamp portion 101 has a hole portion 101 a formed at the center thereof.
- the multilayer optical recording medium 100 comprises a substrate 110 , a guide layer group 111 , a recording layer group 112 , and a cover layer 113 .
- the guide layer group 111 , the recording layer group 112 , and the cover layer 113 are sequentially provided on the substrate 110 .
- the substrate 110 is made of a resin material such as polycarbonate and has the clamp portion 101 at the center thereof.
- the substrate 110 is formed to be capable of supporting the guide layer group 111 , the recording layer group 112 , and the cover layer 113 in the recording region 102 .
- the guide layer group 111 is provided on the substrate 110 and constituted of guide layers that perform positioning of a later-described optical device 4 of the drive device 1 in a radial direction. It should be noted that the radial direction is a radial direction of the multilayer recording medium 100 .
- Each guide layer in the guide layer group 111 is formed into, for example, a concentric or helical groove structure and has a column with light reflection involving diffracted light.
- the guide layer group 111 comprises a first guide layer 121 and a second guide layer 122 from the substrate 110 side.
- Each of the first guide layer 121 and the second guide layer 122 has a groove structure in which lands as concave portions and grooves as convex portions are formed.
- information of track positions where the optical device 4 is positioned is recorded.
- the track positions are, for example, track numbers or the like each indicating a position of a track of the multilayer optical recording medium 100 .
- signs Cg as information of the track positions are recorded.
- the recording layer group is constituted of recording layers that can record information.
- the recording layer group 112 comprises a first recording layer 131 , a second recording layer 132 , a third recording layer 133 , a fourth recording layer 134 , a fifth recording layer 135 , a sixth recording layer 136 , a seventh recording layer 137 , an eighth recording layer 138 , a ninth recording layer 139 , and a tenth recording layer 140 from the substrate 110 side.
- a position in the radial direction of each of the first recording layer 131 , the third recording layer 133 , the fifth recording layer 135 , the seventh recording layer 137 , and the ninth recording layer 139 is determined based on information of a track position in the first guide layer 121 .
- a position in the radial direction of each of the second recording layer 132 , the fourth recording layer 134 , the sixth recording layer 136 , the eighth recording layer 138 , and the tenth recording layer 140 is determined based on information of a track position in the second guide layer 122 .
- track information 150 is recorded by the later-described drive device 1 .
- the cover layer 113 is made of a light transmissive material and protects the recording layer group 1120 .
- the track information 150 is information of tracks on the multilayer recording medium 100 which are provided at arbitrary positions P 1 to Pn in positions (n positions) in the radial direction of the multilayer optical recording medium 100 in any one of the first recording layer 131 to the tenth recording layer 140 in the recording layer group 112 .
- the track information 150 includes first track information 151 to nth track information provided at arbitrary positions Pl to Pn.
- positions P 1 to P 3 may be positions arbitrarily input from the outside or may be positions preset in the multilayer optical recording medium 100 or the drive device 1 .
- arbitrary positions P 1 to P 3 in the tenth recording layer 140 where the track information 150 is provided are set at three positions, for example, a position close to the clamp portion 101 of the substrate 110 , a position close to an outer peripheral edge of the substrate 110 , and an intermediate position between the position close to the clamp portion 101 and the position close to the outer peripheral edge of the substrate 110 as shown in FIG. 1 .
- position P 1 , position P 2 , and position P 3 are provided from the clamp portion 101 side toward the outer peripheral edge side of the substrate 110 . Furthermore, the first track information 151 , the second track information 152 , and the third track information 153 are provided at position P 1 to position P 3 , respectively.
- positional information of the recording layer group 112 based on track positions in either the first guide layer 121 or the second guide layer 122 in a predetermined range of the respective arbitrary positions P 1 to P 3 is recorded.
- the first track information 151 to the third track information 153 are provided in the tenth recording layer 140 based on the information of the track positions in the second guide layer 122 .
- Each of the first track information 151 to the third track information 153 is constituted by recording sign Cr of the tenth recording layer 140 associated with sign Cg in a predetermined range of the second guide layer 122 at each of arbitrary positions P 1 to P 3 is recorded in the tenth recording layer 140 .
- Sign Cr includes a sign Cr 1 that is recorded in the first track information 151 and associated with sign Cg at position P 1 , a sign Cr 2 which is recorded in the second track information and associated with sign Cg at position P 2 , and a sign Cr which is recorded in the third track information 153 and associated with sign Cg at position P 3 .
- signs Cg are provided with 21 to 27 in the second guide layer 122 in a predetermined region 200 at arbitrary position P 1 as track position information.
- the first track information 151 to the third track information 153 can be obtained by deriving signs Cr which are uniquely derived from signs Cg of the second guide layer 122 in the predetermined range at the respective positions P 1 to P 3 .
- a command value Vg for tracking control that maximizes a reflected light volume of a laser beam 98 in the second guide layer 122 and a command value Vr for tracking control that maximizes a reflected light volume of a laser beam 99 in the tenth recording layer 140 are recorded, respectively.
- command values Vg and Vr are commands that allow the optical device 4 to perform the tracking control of the second guide layer 122 and the tracking control of the tenth recording layer 140 by using the control device 5 in the later-described drive device 1 .
- Command values Vg and Vr are, for example, digital signals indicative of voltages or the like, and particulars thereof can be appropriately set in accordance with a configuration of the drive device 1 .
- the drive device 1 is formed as a drive for the multilayer optical recording medium 100 to enable recording of information in the multilayer recording medium 100 and reproduction of information recorded in the multilayer optical recording medium 100 .
- the drive device 1 constitutes a reproducing and recording apparatus.
- the drive device 1 comprises a spindle device 3 that rotates the multilayer optical recording medium 100 , the optical device 4 that can emit a laser beam, and a control device 5 that controls the spindle device 3 and the optical device 4 .
- the spindle device 3 comprises a disk clamp 11 , a spindle motor 12 , and a rotary encoder 13 .
- the disk clamp 11 is configured to support the multilayer optical recording medium 100 when it is fitted in the hole portion 101 a of the clamp portion 101 of the multiplayer optical recording medium 100 .
- the rotary encoder 13 is configured to detect a rotation angle and the number of revolutions of the spindle motor 12 .
- the optical device 4 comprises a feed device 21 , an objective lens device (a lens device) 22 , a guide layer optical device 23 that can emit the laser beam 98 , a recording layer optical device 23 that can emit the laser beam 99 , and a dichroic mirror (DM) 25 .
- a lens device an objective lens device
- a guide layer optical device 23 that can emit the laser beam 98
- a recording layer optical device 23 that can emit the laser beam 99
- DM dichroic mirror
- the feed device 21 comprises: a support body 31 which is configured to support the objective lens device 22 , the guide layer optical device 23 , the recording layer optical device 24 , and the DM 25 ; and a feed motor 32 which is driving means for moving the support body 31 in the radial direction of the multilayer optical recording medium 100 supported by the disk clump 11 .
- the objective lens device 22 comprises an objective lens 34 that is configured to converge the laser beams 98 and 99 emitted from the guide layer optical device 23 and the recording layer optical device 24 , a first actuator 35 that adjusts focus of the laser beams 98 and 99 that pass through the objective lens 34 , and a second actuator 36 that adjusts positions in the radial direction irradiated with the laser beams 98 and 99 that pass through the objective lens 34 .
- the objective lens 34 is arranged to face a cover layer 113 of the multilayer optical recording medium 100 supported by the disk clamp 11 .
- the objective lens 34 allows the supplied laser beams 98 and 99 to exit therefrom along the same optical axis.
- the first actuator 35 is configured to drive the objective lens 34 and thereby enable so-called focusing for adjusting convergence of the laser beams 98 and 99 effected by the objective lens 34 .
- the first actuator 35 irradiates arbitrary layers in the guide layer group 111 and the recording layer group 112 with the laser beams 98 and 99 by driving the objective lens 34 .
- the second actuator 36 is configured to enable so-called tracking for adjusting a position of the objective lens 34 in the radial direction by driving the objective lens 34 .
- the second actuator 36 adjusts positions irradiated with the laser beams 98 and 99 in the radial direction by driving the objective lens 34 .
- the guide layer optical device 23 comprises a guide layer light source 37 , a collimator lens 38 , a polarization beam splitter (PBS) 39 , a guide layer lens device (a lens device) 40 , a condensing lens 41 , and a light receiving element 42 .
- the guide layer optical device 23 is configured to supply the laser beam 98 to any layer in the guide layer group 111 and receive the laser beam 98 reflected from any layer in the guide layer group 111 .
- the guide layer light source 37 is a supply source of the laser beam 98 which has a transmitting element and is configured to emit the laser beam 98 from the transmitting element.
- the laser beam 98 emitted from the guide laser light source 37 is formed with a wavelength longer than that of the laser beam 99 emitted from the recording layer light source 47 .
- the laser beam 98 is, for example, a red laser beam.
- the collimator lens 38 is formed to convert the laser beam 98 emitted from the guide layer light source 37 into parallel light.
- the PBS 39 is configured to reflect or transmit the laser beam 98 .
- the PBS 39 is configured to supply the laser beam 98 , which is the parallel light converted by the collimator lens 38 , to the DM 25 as it is. Further, the PBS 39 is configured to supply the laser beam 98 , which is the parallel light supplied from the DM 25 , to the condensing lens 41 .
- the guide layer lens device 40 is configured to perform focusing and tracking of the laser beam 98 traveling between the PBS 39 and the DM 25 .
- the guide layer lens device 40 comprises a guide layer lens 44 that allows the laser beam 98 which is the parallel light supplied from the PBS 39 or the DM 25 to pass therethrough, a third actuator 45 that performs focusing of the guide layer lens 44 , and a fourth actuator 46 that carries out tracking of the guide layer lens 44 .
- the focusing lens 41 converges the laser beam 98 which is the parallel light supplied from the DM 25 through the guide layer lens device 40 and the PBS 39 and allows the converged light to exit therefrom.
- the light receiving element 42 receives the laser beam 98 converged by the condensing lens 41 and converts information recorded in any layer in the guide layer group 111 into a signal based on the received laser beam 98 .
- the recording layer optical device 24 comprises a recording layer optical source 47 , a collimator lens 48 , a polarization beam splitter (PBS) 49 , a recording layer lens device (a lens device) 50 , a condensing lens 51 , and a light receiving element 52 .
- the recording layer optical device 24 is configured to supply the laser beam 99 to any layer in the recording layer group 112 and receive the laser beam 99 reflected from any layer in the recording layer group 112 .
- the recording layer light source 47 is a supply source of the laser beam 99 which has a transmitting element and is configured to emit the laser beam 99 from the transmitting element. Moreover, the recording layer light source 47 is configured to emit the laser beam with an output value that differs depending on reproduction of information recorded in any layer in the guide layer group 111 and recording of information into any layer in the recording layer group 112 . It should be noted that laser beam 99 at the time of reproduction has an output value lower than that of laser beam 99 at the time of recording.
- a wavelength of laser beam 99 emitted from the recording layer light source 47 is formed shorter than that of laser beam 98 emitted from the guide layer light source 37 .
- the laser beam 99 is, for example, a blue laser.
- the collimator lens 48 is configured to convert the laser beam 99 emitted from the recording layer light source 47 into parallel light.
- the PBS 49 is configured to reflect or transmit the laser beam 99 .
- the PBS 49 is configured to supply the laser beam 99 , which is the parallel light converted by the collimator lens 48 , to the DM 25 as it is. Additionally, the PBS 49 is configured to supply the laser beam 99 , which is the parallel light supplied from the DM 25 , to the condensing lens 51 .
- the recording layer lens device 50 is configured to perform focusing and tracking of the laser beam 99 traveling between the PBS 49 and the DM 25 .
- the recording layer lens device 50 comprises a recording layer lens 54 that allows the laser beam 99 which is the parallel light supplied from the PBS 49 or the DM 25 to pass therethrough, a fifth actuator 55 that performs focusing of the recording layer lens 54 , and a sixth actuator 56 which carries out tracking of the recording layer lens 54 .
- the condensing lens 51 converges the laser beam 99 which is the parallel light supplied from the DM 25 through the recording layer lens device 50 and the PBS 49 , and allows the converged light to exit to the light receiving element 52 .
- the light receiving element 52 receives the laser beam 99 converged by the condensing lens 51 and converts information recorded in any layer in the recording layer group 112 into a signal based on the received laser beam 99 .
- the DM 25 is configured to supply the laser beams 98 and 99 , which are supplied from the guide layer optical device 23 and the recording layer optical device 24 , to the objective lens 34 and reflect and transmit the laser beams 98 and 99 . Furthermore, the DM 25 is configured to supply the laser beams 98 and 99 reflected by the multilayer optical recording medium 100 to the guide layer optical device 23 and the recording layer optical device 24 .
- the control device 5 comprises a spindle motor control unit 61 , a feed motor control unit 62 , an objective lens control unit 63 , a guide layer control unit 64 , a recording layer control unit 65 , a signal bus 66 , and a main control unit 67 .
- the spindle motor control unit 61 is connected to the spindle motor 12 and the rotary encoder 13 and configured to control the number of revolutions of the multilayer optical recording medium 100 supported on the disk clump 11 by controlling drive of the spindle motor 12 .
- the feed motor control unit 62 is connected to the feed motor 32 and configured to control a traveling length of the objective lens 34 supported on the support body 31 by controlling drive of the feed motor 32 .
- the objective lens control unit 63 comprises a first control unit 71 that controls the first actuator 35 and a second control unit 72 that controls the second actuator 36 .
- the first control unit 71 is configured to control focusing of the objective lens 34 by controlling the first actuator 35 .
- the second control unit 72 is configured to control tracking of the objective lens 34 by controlling the second actuator 36 .
- the guide layer control unit 64 comprises a third control unit 73 that controls the third actuator 45 , a fourth control unit 74 that controls the fourth actuator 46 , a guide layer radio frequency amplifier (an RF amplifier) 75 , a guide layer error signal generation unit 76 , and a guide layer reproduction signal generation unit 77 .
- a guide layer radio frequency amplifier an RF amplifier
- the third control unit 73 is configured to control focusing of the guide layer lens 44 by controlling the third actuator 45 .
- the fourth control unit 74 is configured to control tracking of the guide layer lens 44 by controlling the fourth actuator 46 .
- the guide layer RF amplifier 75 is configured to amplify the signal of the laser beam 98 converted by the light receiving element 42 .
- the guide layer error signal generation unit 76 is connected to the third control unit 73 , the fourth control unit 74 , and the guide layer RF amplifier 75 and configured to generate an error signal from information of the laser beam 98 received by the light receiving element 42 when error information is included in this information.
- the guide layer reproduction signal generation unit 77 is configured to generate a reproduction signal, which is used for reproducing information, from the information of the laser beam 98 received by the light receiving element 42 . It should be noted that the guide layer reproduction signal generation unit 77 does not generate the reproduction signal when the information of the laser beam 98 is the error information.
- the recording layer control unit 65 comprises a fifth control unit 79 that controls the fifth actuator 55 , a sixth control unit 80 that controls the sixth actuator 56 , a recording layer radio-frequency (RF) amplifier 81 , a recording layer error signal generation unit 82 , and a recording layer reproduction signal generation unit 83 .
- RF radio-frequency
- the fifth control unit 79 is configured to control focusing of the recording layer lens 54 by controlling the fifth actuator 55 .
- the sixth control unit 80 is configured to control tracking of the recording layer lens 54 by controlling the sixth actuator 56 .
- the recording layer RF amplifier 81 is configured to amplify the information of the laser beam 99 converted by the light receiving element 52 .
- the recording layer error signal generation unit 82 is connected to the fifth control unit 79 , the sixth control unit 80 , the recording layer RF amplifier 81 .
- the recording layer error signal generation unit 82 is configured to generate an error signal from the information of the laser beam 99 received by the light receiving element 52 when error information is included in this information.
- the recording layer reproduction signal generation unit 83 is configured to generate a reproduction signal from the information of the laser beam 99 received by the light receiving element 52 . It should be noted that the recording layer reproduction signal generation unit 83 does not generate the reproduction signal when the information of the laser beam 99 is error information.
- the signal bus 66 is configured to connect the spindle motor control unit 61 , the feed motor control unit 62 , the main control unit 67 , the first control unit 71 , the second control unit 72 , the third control unit 73 , the fourth control unit 74 , the guide layer error signal generation unit 76 , the guide layer reproduction signal generation unit 77 , the fifth control unit 79 , the sixth control unit 80 , the recording layer error signal generation unit 82 , and the recording layer reproduction signal generation unit 83 .
- the main control unit 67 controls the spindle motor control unit 61 , the feed motor control unit 62 , the first control unit 71 , the second control unit 72 , the third control unit 73 , the fourth control unit 74 , the guide layer error signal generation unit 76 , the guide layer reproduction signal generation unit 77 , the fifth control unit 79 , the sixth control unit 80 , the recording layer error signal generation unit 82 , and the recording layer reproduction signal generation unit 83 connected through the signal bus 66 .
- the main control unit 67 rotates the multilayer optical recording medium 100 at a predetermined number of revolutions by controlling the spindle motor control unit 61 and the feed motor control unit 62 , and moves the objective lens 34 to a position at which recording or reproduction of the multilayer optical recording medium 100 is performed.
- the main control unit 67 controls exit and stop of the laser beams 98 and 99 by controlling the guide layer light source 37 and the recording layer light source 47 .
- the main control unit 67 controls the first control unit 71 , the second control unit 72 , the third control unit 73 , the fourth control unit 74 , the fifth control unit 79 , and the sixth control unit 80 based on a command from the outside and the signals received from the guide layer error signal generation unit 76 , the guide layer reproduction signal generation unit 77 , the recording layer error signal generation unit 82 , and the recording layer reproduction signal generation unit 83 , thereby effecting focusing and tracking of the laser beams 98 and 99 .
- the main control unit 67 has a memory unit 67 a that stores a threshold value D which is information of a degree of warpage of the multilayer optical recording medium 100 , the memory unit 67 a being capable of storing the information of the multilayer optical recording medium 100 received by the light receiving elements 42 and 52 and maintaining a function of the multilayer optical recording medium 100 .
- the function of the multilayer optical recording medium 100 is, for example, a function for reproducing and recording information, and a range of a degree of warpage that can allow such a function is set as the threshold value D.
- the main control unit 67 has the following functions (1) to (4).
- the function (1) is configured to receive information of the sign Cg of the second guide layer 122 and derive the sign Cr which is the information of the track position in the tenth recording layer 140 uniquely derived from the sign Cg. Further, signs Cr 1 to Crn which are information of track positions in the tenth recording layer 140 in a predetermined region of the arbitrary positions P 1 to Pn are derived from the signs Cg in the predetermined region of the arbitrary positions P 1 to Pn in the second guide layer 122 . This is a function of recording the derived signs Cr 1 to Crn in the predetermined region of the positions P 1 to Pn with respect to the first track information 151 to the nth track information.
- the function (1) acquires control information of the guide layer optical device 23 and the recording layer optical device 24 that maximize reflected light volumes of the laser beams 98 and 99 from the signs Cg and the signs Cr 1 to the sign Cr at the arbitrary positions P 1 to Pn as the track information 150 .
- this function derives a command value Vg 1 to a command value Vgn of the second guide layer and a command value Vr 1 to a command value Vrn of the tenth recording layer 140 as command values that maximize the reflected light volumes at the predetermined positions P 1 to Pn.
- the function (1) is a function of recording the derived command values Vg 1 to Vgn of the second guide layer 122 and the derived command values Vr 1 to Vrn of the tenth recording layer 140 into the first track information 151 to the nth track information at the respective predetermined positions P 1 to Pn.
- the function (2) is a function of obtaining a command value Vg 1 ′ of the second guide layer 122 and a command value Vr 1 ′ of the tenth recording layer 140 obtained by calibrating an inclination (tilt inclination) of the disk clamp 11 in a tilt direction based on irradiation positions of the laser beams 98 and 99 at the arbitrary position Pn, for example, the arbitrary position Pn provided on the innermost side of the multilayer optical recording medium 100 where a degree of warpage is minimum.
- a position of the sign Cg 1 and the sign Cr 1 of the first track information 151 recorded in the multilayer optical recording medium 100 is irradiated with the laser beams 98 and 99 , respectively, and the command value Vg 1 ′ and the command value Vr 1 ′ that maximize the reflected light volumes of the laser beams 98 and 99 are obtained.
- each of the command value Vg 1 and the command value Vr 1 recorded in the first track information 151 at the position P 1 and each of the newly obtained command values Vg 1 ′ and Vr 1 ′ is a tilt inclination of the disk clamp 1 . Therefore, each of the command value Vg 1 ′ and the command value Vr 1 ′ is a calibration value obtained by calibrating the tilt inclination.
- the function (2) is a function that determines each of the derived command values Vg 1 ′ and Vr 1 ′ as each of the command values Vg 1 ′ and Vr 1 ′ considering the tilt inclination of the multilayer optical recording medium 100 supported by the disk clamp 11 and sets each determined value as a reference value obtained by calibrating the tilt inclination. It should be noted that the obtained command values Vg 1 ′ and Vr 1 ′ are stored in the memory unit 67 a.
- the function (3) is a function of obtaining a command value Vg 2 ′ to a command value Vgn′ of the second guide layer 122 and a command value Vr 2 ′ to a command value Vgn′ of the tenth recording layer 144 at the arbitrary positions P 2 to Pn and obtaining a degree of warpage ⁇ Vg′ of the second guide layer 122 from a difference between the command value Vg 1 ′ at the position P 1 and each of the command values Vg 2 ′ to the command value Vgn′ acquired at the other arbitrary positions P 2 to Pn.
- the function (3) is a function of obtaining a degree of warpage ⁇ Vrn′ of the tenth recording layer 140 at each position Pn from a difference between the command value Vr 1 ′ of the tenth recording layer 144 and each of the command value Vr 2 ′ to the command value Vrn acquired at the other arbitrary positions P 2 to Pn.
- the function (3) is a function of obtaining a degree of warpage Vgn of the second guide layer 122 and a degree of warpage ⁇ Vrn of the tenth recording layer from the command value Vg 1 to the command value Vgn of the second guide layer 122 and the command value Vr 1 to the command value Vrn of the tenth recording layer 140 in recording of the track information at the time of deriving the track information 150 .
- the former represents each value at the time of recording the track information 150 in any layer in the recording layer group 112 of the multilayer optical recording medium 100
- the latter represents each value derived from the multilayer optical recording medium 100 having the track information 150 recorded in any layer in the recording layer group 112 , respectively.
- the function (4) obtains the degree of warpage ⁇ Vgn′ and the degree of warpage ⁇ Vrn′ at the arbitrary position Pn from the track information 150 recorded in the multilayer optical recording medium 100 by the function (1) and the command value Vgn′ and the command value Vrn′ at the arbitrary position Pn in the multilayer optical recording medium 100 newly acquired by the function (2) and the function (3).
- the function (4) is a function of determining whether each of the obtained the degree of warpage dVgn and the degree of warpage dVrn caused by age deterioration is a degree of warpage that can maintain the function of the multilayer optical recording medium 100 from the threshold value D of the degree of warpage that can maintain the function stored in the memory unit 67 a.
- the main control unit 67 rotates the multilayer optical recording medium 100 by the spindle device 3 . Further, the main control unit 67 controls the feed motor control unit 62 to the position P 1 provided on the innermost side of the multilayer optical recording medium 100 and moves the objective lens 34 to the arbitrary position P 1 (step ST 12 ).
- the main control unit 67 performs focusing control (step ST 13 ) and tracking control (step ST 14 ) of the objective lens 34 after the objective lens 34 is moved to the arbitrary position P 1 .
- the main control unit 67 controls the first control unit 71 , the second control unit 72 , and the guide layer light source 37 , drives the objective lens 34 , and allows the laser beam 98 to follow, for example, the second guide layer 122 in the guide layer group 111 .
- the main control unit 67 controls the fourth control unit 74 based on a light receiving signal of the laser beam 98 reflected on the second guide layer 122 and carries out the tracking control of the guide layer lens 44 .
- the main control unit 67 derives a position of the guide layer lens 44 where the laser beam 98 reflected on the second guide layer 122 becomes maximum by controlling the fourth control portion 74 , and derives the command value Vg 1 that maximizes the laser beam 98 in the tracking control at the arbitrary position P 1 (step ST 15 ).
- the main control unit 67 derives the sign Cg representing a position of a track in a predetermined region 200 at the arbitrary position P 1 (step ST 16 ).
- the main control unit 67 controls the sixth control unit 80 based on a light receiving signal of the laser beam 99 reflected on the tenth recording layer 144 and performs the tracking control of the recording layer lens 54 .
- the main control unit 67 derives a position of the recording layer lens 54 where the laser beam 99 reflected from the tenth recording layer 140 becomes maximum by controlling the sixth control unit 80 and derives the command value Vr 1 that maximizes the laser beam 99 at the arbitrary position P 1 in the tracking control (step ST 17 ).
- the main control unit 67 derives the uniquely derived sign Cr 1 of the tenth recording layer 140 from the signs Cg of the second guide layer 122 in the predetermined region 200 of the position P 1 stored in the memory unit 67 a (step ST 18 ).
- the sign Cr 1 is, for example, an integer corresponding to a track of each sign Cg.
- the signs Cg in the predetermined range of the arbitrary position P 0 are 21 to 27, 1 to 7 each of which is an integer of the first digit of each sign Cg are derived as the sign Cr 1 .
- the main control unit 67 records the command value Vg 1 of the second guide layer 122 obtained at the arbitrary position P 1 and the command value Vr 1 and the sign Cr 1 of the 10th recording layer 140 in a predetermined region in the 10th recording layer 140 at the arbitrary position P 1 (step ST 19 ).
- the first track information 151 is recorded at the arbitrary position P 1 .
- the main control unit 67 determines whether the track information 150 has been recorded at all the positions P 1 to P 3 (step ST 20 ). When the track information 150 has not been recorded at all positions P 1 to P 3 (NO in step ST 20 ), the processing returns to the step ST 12 , and the main control unit 67 moves the objective lens 34 to the next arbitrary position Pn and then repeats the processing at the step ST 13 or subsequent steps. For example, when the track information 150 has not been recorded at the position P 1 to the position P 3 and the first track information 151 has been recorded at the position P 1 , the main control unit 67 moves the objective lens 34 to the subsequent arbitrary position P 2 (step ST 12 ) and carries out the processing at the step ST 13 and subsequent steps.
- the main control unit 67 terminates the recording of the track information 150 . In this manner, the track information 150 is recorded at the position P 1 to the position P 3 set in the multilayer optical recording medium 100 .
- the degree of warpage ⁇ Vg of the second guide layer 122 and the degree of warpage ⁇ Vr of the tenth recording layer 140 in the multilayer optical recording medium 100 at the time of recording the track information 150 are obtained from the command value Vg 1 to the command value Vgn, and the command value Vr 1 to the command value Vgrn acquired by this recording method and the function (3) of the main control unit 67 .
- the main control unit 67 may record the amounts of warp ⁇ Vg and ⁇ Vr in the tenth recording layer 140 together with the track information 150 .
- the main control unit 67 rotates the multilayer optical recording medium 100 supported by the disk clamp 11 . Then, the main control unit 67 derives the position P 1 to the position Pn, which are the position P 1 to the position P 3 in this example, as detecting positions where the track information 150 of the multilayer optical recording medium 100 is recorded from the track information 150 recorded in the tenth recording layer 140 in the recording layer group 112 of the multilayer optical recording medium 100 (step ST 31 ).
- the main control unit 67 controls the feed motor control unit 62 and adjusts the objective lens 34 to face the position P 1 provided on the innermost side of the multilayer optical recording medium 100 (step ST 32 ).
- the main control unit 67 moves the objective lens 34 to the position P 1 and then carries out focusing control (step ST 33 ) and tracking control (step ST 34 ) of the objective lens 34 .
- the main control unit 37 controls the first control unit 71 and the second control unit 72 , drives the objective lens 34 , and enables the laser beam 98 to follow a track associated with the sign Cg 1 , which is the target sign Cgn at this point in time, in the second guide layer 122 .
- the main control unit 67 controls the fourth control unit 74 based on a light receiving signal of the laser beam 98 reflected on the second guide layer 122 and performs tracking control over the guide layer lens 44 .
- the main control unit 67 derives a position of the guide layer lens 44 that maximizes the laser beam 98 reflected from the second guide layer 122 by controlling the fourth control unit 74 and derives the command value Vg 1 ′ which is the command value Vgn′ that maximizes the laser beam 98 in the tracking control at the position P 1 (step ST 35 ).
- the main control unit 67 stores this command value Vg 1 ′ of the second guide layer 122 in the memory unit 67 a.
- the main control unit 67 derives the sign Cg 1 to which the number of racks in the predetermined region 200 of the position P 1 is assigned and stores the derived sign in the memory unit 67 a (step ST 36 ).
- the main control unit 67 controls the sixth control unit 80 based on a light receiving signal of the laser beam 99 reflected from the tenth recording layer 140 and performs tracking control over the recording layer lens 54 .
- the main control unit 67 controls the sixth control unit 80 and thereby derives the command value Vr 1 ′ which is the command value Vrn′ in a state that the laser beam 99 is enabled to follow the track on which the sign Cr 1 corresponding to the target sign Crn is recorded (step ST 38 ).
- the main control unit 67 stores the derived command value Vg 1 ′ of the second guide layer 122 and the derived command value Vr 1 ′ of the tenth recording layer 140 in the memory unit 67 a.
- the main control unit 67 determines that an allowable optical axis deviation is exceeded because of function loss of the multilayer optical recording medium 100 or a failure of the drive device 1 . It should be noted that a situation where the command value Vg of the second guide layer 122 and the command value Vr 1 ′ of the tenth recording layer 140 exceed the allowable values is, for example, a situation where one sign Cg 1 and the sign Cr 1 associated with the one sign Cg 1 are followed and the reflected laser beams 98 and 99 cannot perform reading.
- the main control unit 67 determines whether the command values Vgn′ of the second guide layer 122 (the command value Vg 1 ′ to the command value Vg 3 ′) and the command values Vrn′ of the tenth recording layer 140 (the command value Vr 1 ′ to the command value Vr 3 ′) have been derived at all of the arbitrary positions P 1 to P 3 (step ST 39 ).
- step ST 39 When the command values Vrn′ and Vgn′ have not been derived at all of the arbitrary positions P 1 to P 3 (NO in step ST 39 ), the processing returns to the step ST 32 , the objective lens 34 is moved to the next arbitrary position P 2 , the processing at the step ST 33 and subsequent steps is repeated, the command values Vg 2 ′ and the command values Vr 2 ′ are derived, and the processing is repeated until the command values Vgn′ and the command values Vrn at the respective positions P 2 to P 1 are all derived.
- the main control unit 67 derives the degree of warpage ⁇ Vg′ and the degree of warpage ⁇ Vr′ of the multilayer optical recording medium 100 (step ST 40 ).
- the main control unit 67 derives the degree of warpage ⁇ Vg of the second guide layer 122 and the degree of warpage ⁇ Vr of the tenth recording layer 144 in the multilayer optical recording medium 100 at the time of recording the track information 150 from the command value Vg 1 to the command Vgn and the command value Vr 1 to the command value Vrn recorded in the track information 150 .
- the main control unit 67 also derives the degree of warpage ⁇ Vg′ of the second guide layer 122 and the degree of warpage ⁇ Vr′ of the tenth recording layer 140 in the multilayer optical recording medium 100 at the time of detecting the degrees of warpage in the track information 150 from the derived command values Vg 1 ′ to Vgn′ and the derived command values Vgn′ to Vr 1 ′.
- the main control unit 67 derives the degree of warpage dVgn of the second guide layer 122 and the degree of warpage dVrn of the tenth recording layer 140 caused by age deterioration from the degree of warpage ⁇ Vg of the second guide layer 122 and the degree of warpage ⁇ Vrn of the tenth recording layer 140 recorded in the track information and the derived degree of warpage ⁇ Vg′ of the second guide layer 122 and the derived degree of warpage ⁇ Vrn′ of the tenth recording layer 140 .
- the main control unit 67 compares the threshold value D which is a degree of warpage that is stored in the memory unit 67 a and enables maintaining the function of the multilayer optical recording medium 100 with each of the derived degree of warpage dVgn of the second guide layer 122 and the derived degree of warpage dVrn of the tenth recording layer 140 at each position Pn caused by age deterioration (step ST 41 ).
- the main control unit 67 determines that the warp (degree of warpage) of the multilayer optical recording layer 100 caused by age deterioration falls within the allowable range that enables maintaining the function of the multilayer optical recording medium 100 (step ST 42 ).
- the main control unit 67 determines that the degree of warpage of the multilayer optical recording medium 100 exceeds the allowable range and the multilayer optical recording medium 100 is unusable (step ST 43 ). It should be noted that the main control unit 67 informs, for example, a system or a display unit different from the drive device 1 connected to the main control unit 67 of a result of the determination on each degree of warpage of the multilayer optical recording medium 100 , thereby giving this information to a user.
- the degree of warpage dVgn of the second guide layer 122 and the degree of warpage dVrn of the tenth recording layer 140 in the multilayer optical recording medium 100 caused by age deterioration are detected, and whether the multilayer optical recording medium 100 can be used is determined.
- the multilayer optical recording medium 100 and the drive device 1 having such a configuration, it is possible to derive an amount of physical warp of the multilayer optical recording medium 100 before or after aged deterioration in accordance with the track information 150 recorded in any recording layer in the recording layer group 112 at each of arbitrary positions P 1 to Pn in the multilayer optical recording medium 100 .
- an amount of physical warp thereof can be detected by the drive device 1 from information of the guide layer group 111 and the recording layer group 112 provided in the multilayer optical recording medium 100 without additionally measuring this degree of warpage by using an inspection device or the like. Therefore, for example, the degree of warpage can be detected by the drive device 1 that performs recording and reproduction of the multilayer optical recording medium 100 without additionally using a device that can detect the degree of warpage, thereby improving usability.
- the degree of warpage of the multilayer optical recording medium 100 can be detected.
- the multilayer optical recording medium 100 , the drive device 1 , the inspection method for a degree of warpage of the multilayer optical recording medium 100 of this embodiment are not restricted to the above-described configuration.
- the description has been given as to the configuration where the track information 150 is recorded in the multilayer optical recording medium 100 by the drive device 1 and then a degree of warpage of the multilayer optical recording medium 100 is derived in the above instance, but the present embodiment is not restricted thereto.
- the track information 150 may be recorded in advance, and detection of a degree of warpage alone may be performed in the drive device 1 .
- the drive device 1 may be configured to have the reproducing function alone without having the recordable function, and even the drive device 1 having the reproducing function alone can detect a degree of warpage of the multilayer optical recording medium 100 .
- the drive device 1 may be configured have only the function that enables recording the track information 150 without having the reproducing function.
- each of the degree of warpage ⁇ Vg′ of the second guide layer 122 and the degree of warpage ⁇ Vr′ of the tenth recording layer 140 derived by the drive device 1 may be compared with the threshold value D.
- each of the command value Vg 1 ′ to the command value Vgn′ of the second guide layer 122 and the command value Vr 1 ′ to the command value Vrn′ of the tenth recording layer 140 may be compared with the threshold value D.
- a threshold value for an allowable degree of warpage can be individually set in accordance with, for example, a material of the multilayer optical recording medium 100 .
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- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
ΔVgn′=Vgn′−Vg1′
ΔVrn′=Vrn′−Vr1′
dVgn=ΔVgn′−ΔVgn
dVgn=ΔVgn′−ΔVgn
the degree of warpage dVgn and the degree of warpage dVrn are variations of the degree of warpage of the
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JP2012065618A JP5646531B2 (en) | 2012-03-22 | 2012-03-22 | Multilayer optical recording medium, drive device, and multilayer optical recording medium inspection method |
JP2012-065618 | 2012-03-22 |
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JP5646531B2 (en) | 2014-12-24 |
JP2013196742A (en) | 2013-09-30 |
US20130250743A1 (en) | 2013-09-26 |
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